Mechanism Analysis of Static Var Source Depressing Subsynchronous Oscillations
Li Wei, Xiao Xiangning, Zhao Yang
Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Under Ministry of Education North China Electric Power University Beijing 102206 China
Abstract：The mechanism of static var source depressing power system subsynchronous oscillations(SSO) is analyzed detailedly, and then the mathmatical expression of supplementary electrical damping along with its influencing factors are put forward. A multiple mass-lumped model of a generating unit and its decoupled equations of motion are established too. Furthermore, the effectiveness of static var source connected to the network to improve subsynchronous oscillation damping characteristics is testified analytically. Finally, the electromagnetic transient model of single machine power system including a fixed series compenstion capacitor is established by real-time digital simulator (RTDS). The simulation results show that it is effective for static var source to depress the subsynchronous oscillations of the generator.
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2011, Vol. 26 
